A method for inversion of ultraviolet differential concentration and interference suppression of mixed gas
A mixed gas, interference suppression technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of inaccurate differential absorption spectrum, calculation influence, mutual interference of absorption characteristics, etc., to achieve the effect of suppressing interference and improving accuracy
Active Publication Date: 2020-02-21
安荣信科技(南京)有限公司
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In addition, in the mixed gas, since the absorption characteristics of the various components in the flue gas in some bands will interfere with each other, the differential absorption spectrum extracted by the conventional differential algorithm is not accurate, and will affect the calculation of the concentration of each component in the final flue gas
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[0032] Such as figure 1 As shown, a method for inversion and interference suppression of mixed gas ultraviolet differential concentration includes the following steps:
[0033] (1) According to the number of components in the inversion calculation band, divide the inversion band into a single-component band and a multi-component band, and extract the differential absorption spectrum from the single-component band;
[0034] (2) Inversion and calculation of the component concentration in the single-component band to obtain {C i }, where i represents the type of component, according to {C i }Calculated with the empirical data of the differential absorption cross section to obtain the differential absorption spectrum of the corresponding component {D i },Calculated as follows:
[0035] D i =area i ×C i ×L
[0036] Where area i Indicates the differential absorption cross section of the i-th component at the inversion calculation band. The corresponding concentration in the empirical data i...
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The invention discloses an ultraviolet difference concentration inversion and interference suppression method of mixed gas. The number of components in the waveband is calculated according to inversion, the inversion waveband is divided into a single-component waveband and a multi-component waveband, and a difference absorption spectrum is extracted from the single-component waveband; the concentration [Ci]of the component in the single-component waveband is calculated through inversion, and a corresponding component difference absorption spectrum [Di] is calculated according to [Ci] and experience data of a difference absorption section; the waveband containing one component with unknown concentration is sought from the multi-component waveband, and the difference absorption spectrum [Dj]of the component in the waveband is extracted; corresponding [Cj] is obtained through corresponding calculation with an algorithm with the function of interference suppression according to [Dj] and then added to [Ci], and steps are repeated until the concentration of all components are known. As for components interfering with each other very severely in the mixed gas, the difference absorption spectrum can still be precisely extracted; when the spectrum is severely disturbed at certain inversion wavebands, interference can be still effectively inhibited, and the concentration calculation accuracy is improved.
Description
Technical field [0001] The invention relates to the technical field of gas concentration optical detection, in particular to a method for inversion and interference suppression of mixed gas ultraviolet differential concentration. Background technique [0002] Optical detection method is an effective method to detect the concentration of flue gas. With the development of industrialization, it not only pays attention to benefits, but also begins to pay attention to environmental protection. Therefore, environmental standards are becoming stricter and the accuracy requirements of related environmental detectors are also increasing. Higher. Effective and accurate detection of the concentration of industrial flue gas can help relevant national departments to achieve efficient supervision, which is of great significance to the further development of industrialization and the creation of a pleasant living environment. Compared with chemical detection methods, optical detection methods ...
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IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 杜永强杨逍赵春明邱云王辉
Owner 安荣信科技(南京)有限公司